Quelle  stat_bpf_counters_cgrp.sh   Sprache: Shell

#!/bin/bash
# perf stat --bpf-counters --for-each-cgroup test
# SPDX-License-Identifier: GPL-2.0

set -e

test_cgroups=
if [ "$1" = "-v" ]; then
 verbose="1"
fi

# skip if --bpf-counters --for-each-cgroup is not supported
check_bpf_counter()
{
 if ! perf stat -a --bpf-counters --for-each-cgroup / true > /dev/null 2>&1; then
  if [ "${verbose}" = "1" ]; then
   echo "Skipping: --bpf-counters --for-each-cgroup not supported"
   perf --no-pager stat -a --bpf-counters --for-each-cgroup / true || true
  fi
  exit 2
 fi
}

# find two cgroups to measure
find_cgroups()
{
 # try usual systemd slices first
 if [ -d /sys/fs/cgroup/system.slice ] && [ -d /sys/fs/cgroup/user.slice ]; then
  test_cgroups="system.slice,user.slice"
  return
 fi

 # try root and self cgroups
 find_cgroups_self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
 if [ -z ${find_cgroups_self_cgrp} ]; then
  # cgroup v2 doesn't specify perf_event
  find_cgroups_self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
 fi

 if [ -z ${find_cgroups_self_cgrp} ]; then
  test_cgroups="/"
 else
  test_cgroups="/,${find_cgroups_self_cgrp}"
 fi
}

# As cgroup events are cpu-wide, we cannot simply compare the result.
# Just check if it runs without failure and has non-zero results.
check_system_wide_counted()
{
 check_system_wide_counted_output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)
 if echo ${check_system_wide_counted_output} | grep -q -F "; then
  echo "Some system-wide events are not counted"
  if [ "${verbose}" = "1" ]; then
   echo ${check_system_wide_counted_output}
  fi
  exit 1
 fi
}

check_bpf_counter
find_cgroups

check_system_wide_counted

exit 0